TRS Illinois Retirement Age — Unreduced and Early Retirement by Tier

Unreduced Retirement: The Numbers by Tier

"Unreduced" means your full pension formula with no penalty applied. The age and service requirements depend entirely on your tier.

Tier 1 (first contributed before January 1, 2011) has three paths:

• Age 55 with 35 years of service
• Age 60 with 10 years of service
• Age 62 with 5 years of service

Tier 2 (first contributed on or after January 1, 2011) has one path:

• Age 67 with 10 years of service

That's it. Tier 2 has no 35-year early option, no age-60 pathway. The gap between the two tiers is the largest in any major U.S. public pension system — a Tier 1 member can collect an unreduced pension 12 years earlier than a Tier 2 member with similar service.

Early Retirement: What the Penalty Costs

If you want to retire before reaching your unreduced age, TRS applies a permanent reduction.

Tier 1: Early retirement is available at age 55 with 20 years of service. The penalty is 6% per year (0.5% per month) for every year you're under age 60.

Retiring at 55 with 20 years means a 30% permanent reduction. Retiring at 57 means 18%. At 59, it's 6%. These percentages never go away — they're baked into your pension for life, including the base on which your COLA is calculated.

Tier 2: Early retirement starts at age 62 with 10 years of service. The penalty is 6% per year for every year under age 67.

Retiring at 62 means a 30% cut. At 64, it's 18%. These reductions compound with Tier 2's already-lower COLA (the lesser of 3% or half the CPI-U, non-compounded) to create a significantly smaller lifetime benefit.

The Calculation in Practice

Consider a Tier 1 teacher with 30 years of service and a $90,000 Final Average Salary:

• At age 60 (unreduced): 30 × 2.2% × $90,000 = $59,400/year ($4,950/month)
• At age 57 (3 years early, 18% reduction): $59,400 × 0.82 = $48,708/year ($4,059/month)

That $891/month difference compounds over a 25-year retirement into hundreds of thousands of dollars. The early years of pension payments feel like a win, but the permanent reduction erodes the total benefit over time.

When Service Credit Changes the Math

Additional service credit — purchased or earned — can move you past an eligibility threshold. If you're at 34 years of service and need one more year to reach 35 for the age-55 unreduced option, buying back a year of out-of-state teaching or military time is worth far more than its sticker price.

Similarly, unused sick leave (up to 340 days / 2.0 years of additional service) can push you over a threshold. Sick leave doesn't count toward meeting the initial age-plus-service eligibility, but it does increase your total service credit for the pension calculation.

Making the Decision

Whether to retire early with a reduction or work to your unreduced age is one of the highest-stakes calculations in the TRS process. The TRS Illinois Retirement Guide includes age-by-tier comparison worksheets that show the lifetime impact of retiring at different ages, so you can see the full cost before committing.

See more Illinois guides →